JavaScript 驱动

本节展示了 Neo4j 1.7 版 JavaScript 驱动与 4.x 版 JavaScript 驱动之间的不兼容更改。

最新版本的 Neo4j JavaScript 驱动可在 JavaScript 驱动的官方页面上获取。

session#close() 和 driver#close() 现在返回 Promises，且不再接受回调函数参数。
driver.onError 和 driver.onCompleted 回调已被移除。错误应在相关代码路径中监控（例如通过 Promise#catch 等）。

完整变更日志请参见：https://github.com/neo4j/neo4j-javascript-driver/wiki/4.0-changelog。

示例 1。1.7 版 JavaScript 驱动与 4.0 版 JavaScript 驱动之间的更改示例

4.0 版 JavaScript 驱动的示例代码 1.7 版 JavaScript 驱动的示例代码

4.0 版 JavaScript 驱动的示例代码	1.7 版 JavaScript 驱动的示例代码
`var neo4j = require('neo4j-driver') ... const driver = neo4j.driver(uri, neo4j.auth.basic(user, password)) ... const session = driver.session() try { const tx = session.beginTransaction() const result = await tx.run('CREATE (a:Greeting) SET a.message = $message RETURN a.message + ", from node " + id(a)', { message: 'hello, world' }) const greeting = result.records[0].get(0) console.log(greeting) await tx.commit() } finally { await session.close() }`	var neo4j = require('neo4j-driver').v1 ... const driver = neo4j.driver(uri, neo4j.auth.basic(user, password)) ... const session = driver.session() try { const tx = session.beginTransaction() const result = await tx.run('CREATE (a:Greeting) SET a.message = $message RETURN a.message + ", from node " + id(a)', { message: 'hello, world' }) const greeting = result.records[0].get(0) console.log(greeting) await tx.commit() } finally { session.close(callback) // another session can be chained in callback }

var neo4j = require('neo4j-driver')
...
const driver = neo4j.driver(uri, neo4j.auth.basic(user, password))
...

const session = driver.session()
try {
  const tx = session.beginTransaction()
  const result = await tx.run('CREATE (a:Greeting) SET a.message = $message RETURN a.message + ", from node " + id(a)', { message: 'hello, world' })
  const greeting = result.records[0].get(0)
  console.log(greeting)
  await tx.commit()
} finally {
  await session.close()
}

var neo4j = require('neo4j-driver').v1
...
const driver = neo4j.driver(uri, neo4j.auth.basic(user, password))
...

const session = driver.session()
try {
  const tx = session.beginTransaction()
  const result = await tx.run('CREATE (a:Greeting) SET a.message = $message RETURN a.message + ", from node " + id(a)', { message: 'hello, world' })
  const greeting = result.records[0].get(0)
  console.log(greeting)
  await tx.commit()
} finally {
  session.close(callback) // another session can be chained in callback
}